Is there a way to have vertical stripes on all timelines?
The timeline will highlight between the start and end frame. There is a preview range option that allows a second set of start/end frame values to be used, when this is enabled the one frame range is highlighted in each time based editor. I don't know of any other way to highlight sections of the time based editors.



The only other option would be using markers, these are named triangles shown at the bottom of each timeline.